/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.kimmking.rpcfx.tcp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import lombok.extern.slf4j.Slf4j;

import java.nio.charset.StandardCharsets;
import java.util.List;


/**
 * @author lfy
 */
@Slf4j
public class CustomTcpDecoder extends ByteToMessageDecoder {

    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf in, List<Object> out) throws Exception {
        log.info("custom decode run");
        if (in.readableBytes() <= 8) {
            log.info("CustomTcpDecoder decode:数据长度不足");
            return;
        }
        int headerLen = in.readInt();
        int bodyLen = in.readInt();
        byte[] header = new byte[headerLen];
        byte[] body = new byte[bodyLen];
        in.readBytes(header);
        in.readBytes(body);
        CustomTcpMessage msg = new CustomTcpMessage();
        msg.setHeader(new String(header, StandardCharsets.UTF_8));
        msg.setBody(new String(body, StandardCharsets.UTF_8));
        out.add(msg);

    }
}
